Hey Mike,
No need to go blue in the face. I could tell how strong you felt about EQ back on page 1! I'm very interested in the EQ solution - I've been spending way too much time fiddling with combining IRs.
Using EQ as opposed to IRs is attractive to me, because (if I understand correctly) a sweet acoustic tone can be achieved by forcing the piezo signal to fit a particular frequency curve - I have an LP studio fitted with a powerbridge, a JPX6 with piezo and a Maton with piezo. I have not yet found an IR that will work equally well on all these.
Have you ever produced a frequency curve of your tone or, are you aware of a particular frequency curve profile to shoot for? Richard provided some tips above (I just read them. I'm at work now and will try these tonight) - do you use the same method?